Grant Richards

Philo Vance

Roscoe Karns

Sergeant Heath

Helen Burgess

Ada Greene

Ruth Coleman

Sibella Greene

Elizabeth Patterson

Mrs. Tobias Greene

June Martel

Barton

Ellen Drew

Secretary

Purnell Pratt

John F. X. Markham

Colin Tapley

Chester Greene

James Bush

Rex Greene

Leonard Carey

Lister

Nora Cecil

Harvey Stephens

Ivan F. Simpson

Greta Meyer

Barlowe Borland